Large Object layouts support only three types of pages: Detail Page, Create/Edit Page, and List Page.

UI Events are not supported on Large Object detail pages.

The Primary Attribute component on Large Object detail pages does not support displaying labels.

Within Business Components on Large Object detail pages, Associated Object components do not support setting Roll-Up fields.

Same behavior as standard objects. After enabling “Use custom Create/Edit Page layout,” you can configure the Create/Edit layout independently.

Large Object list pages support List View only.

Large Object list pages do not support Roll-Up field configuration.